HeatmapObjectColorProvider Class

Converts colors from cell values and applies these colors to cells. This is the default color provider.

Namespace: DevExpress.XtraCharts.Heatmap

Assembly: DevExpress.XtraCharts.v21.2.dll

NuGet Package: DevExpress.Charts

Declaration

C#

public class HeatmapObjectColorProvider :
    HeatmapColorProviderBase

VB.NET

Public Class HeatmapObjectColorProvider
    Inherits HeatmapColorProviderBase

Remarks

Use the HeatmapControl.ColorProvider property to assign a HeatmapObjectColorProvider object to the heatmap.

When a heatmap uses HeatmapMatrixAdapter to load data, HeatmapObjectColorProvider converts numeric values stored in HeatmapMatrixAdapter.Values to colors.

When a heatmap uses HeatmapDataSourceAdapter to load data, HeatmapObjectColorProvider converts color data member values to colors. A color data member can store the following values:

• An integer ARGB color value (431493885)
• Three or six digit hex code (#fc0, #ff005d)
• A string color name (SkyBlue)
• A Color object

Examples

The following example converts heatmap cell values to colors:

C#

using DevExpress.Utils;
using DevExpress.XtraCharts;
using DevExpress.XtraCharts.Heatmap;
using System.Drawing;
using System.Windows.Forms;
namespace HeatmapMatrixAdapterSample {
    public partial class Form1 : Form {
        HeatmapControl heatmap;
        public Form1() {
            InitializeComponent();

            heatmap = new HeatmapControl();
            heatmap.Name = "Heatmap";
            this.Controls.Add(heatmap);
            heatmap.Dock = DockStyle.Fill;

            HeatmapMatrixAdapter dataAdapter = new HeatmapMatrixAdapter();
            dataAdapter.XArguments = new string[] { "1", "2", "3" };
            dataAdapter.YArguments = new string[] { "A", "B", "C" };
            dataAdapter.Values = new double[,] {
                { -460545, -1644806, -2031617,},
                { -5247250, -5185306, -7876870 },
                { -12156236, -12042869, -16777088 }
            };
            heatmap.DataAdapter = dataAdapter;

            heatmap.ColorProvider = new HeatmapObjectColorProvider();

            heatmap.AxisY.Reverse = true;
            heatmap.Label.Pattern = "{V}";
            heatmap.Label.Visible = true;
            heatmap.Label.BackColor = Color.FromArgb(120, 255, 255, 255);
        }
    }
}

VB.NET

Imports DevExpress.Utils
Imports DevExpress.XtraCharts
Imports DevExpress.XtraCharts.Heatmap
Imports System.Drawing
Imports System.Windows.Forms

Namespace HeatmapMatrixAdapterSample
    Public Partial Class Form1
        Inherits Form

        Private heatmap As HeatmapControl

        Public Sub New()
            InitializeComponent()
            heatmap = New HeatmapControl()
            heatmap.Name = "Heatmap"
            Me.Controls.Add(heatmap)
            heatmap.Dock = DockStyle.Fill
            Dim dataAdapter As HeatmapMatrixAdapter = New HeatmapMatrixAdapter()
            dataAdapter.XArguments = New String() {"1", "2", "3"}
            dataAdapter.YArguments = New String() {"A", "B", "C"}
            dataAdapter.Values = New Double(,) {
            {-460545, -1644806, -2031617},
            {-5247250, -5185306, -7876870},
            {-12156236, -12042869, -16777088}}
            heatmap.DataAdapter = dataAdapter
            heatmap.ColorProvider = New HeatmapObjectColorProvider()
            heatmap.AxisY.Reverse = True
            heatmap.Label.Pattern = "{V}"
            heatmap.Label.Visible = True
            heatmap.Label.BackColor = Color.FromArgb(120, 255, 255, 255)
        End Sub
    End Class
End Namespace

Inheritance

Object

DevExpress.XtraCharts.Native.NotificationElement

HeatmapColorProviderBase

HeatmapObjectColorProvider